<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      let num1 = +prompt("请输入第一个数")
      let num2 = +prompt("请输入第二个数")
      let num3 = +prompt("请输入第三个数")
      alert(`三个数中的最大数为：${Math.max(num1, num2, num3)}`)
    </script>
  </body>
</html>
